Final answer:
The Rhine River travels along the eastern side of Alsace, with Germany on its opposite bank. This river is a vital conduit for industrial activity and goods transportation in Central Europe.
Step-by-step explanation:
The river that travels along the eastern side of Alsace is the Rhine River. On the other side of the Rhine River, to the east of Alsace, lies Germany.
This historic and economically significant river is a crucial pathway for industrial activity and transports goods via barges from southern Germany to Rotterdam in the Netherlands, Europe's busiest port.
The western side of Alsace borders the Rhine and is part of France. This region hosts Strasbourg, the political capital of the European Union, known for its beauty and strategic importance. In summary, Alsace is nestled between the Rhine River and the eastern border of France, with beautiful landscapes and significant economic activity.